ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department “ABS Plus Disposable Formwork System” developed by ABS BUILDING MATERIALS IND. TRADE CO. LTD. TECHNICAL REPORT OF PLASTIC DISPOSABLE FORMWORKS This report has been prepared in accordance with the Regulations of ITU Revolving Fund Enterprise. Assoc. Prof. Dr. Beyza TAŞKIN Asst. Prof. Dr. Burcu GÜNEŞ İTÜ Civil Engineering Faculty, Civil Engineering Department, RC Structures and Structural Analysis Work Group Lecturers June, 2018 I ITÜ Civil Engineering Faculty, Civil Engineering Department Maslak, 34469, Istanbul Tel: +90 (212)-285-3415 Fax: +90 (212)-2

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Respectfully submitted to ABS Building Materials Reference: Your application on 18.05.2018 with 409861 registration number 1. SUBJECT ABS Building Materials Ind. Trade. Co. Ltd. has made a request to Istanbul Technical University, Civil Engineering Faculty Deanery for a technical report in order to analyze the capacity and behavior of the plastic modular formworks “ABS Plus Disposable Formwork System” developed by themselves. This report has been prepared on the approval of Istanbul Technical University Civil...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Figure 1: Components of ABS Plus Disposable Formwork System: 3D view (top); spacer and base (left); plan view and section of the dome (right) Installation of ABS Plus Disposable Formwork System starts with mounting the bases and spacers on the lean concrete or base slab etc. that already exists. Plastic tubes that will form the columns are assembled onto the bases. Plastic tubes have a standard diameter of 125 mm. Length of the tubes may be adjusted previously or on site according to need. Standard manufacturing...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Numerous parametric analyses were done to determine the structural behavior and capacity requirements of ABS Plus Disposable Formwork System under vertical loads. In these analyses, additional soil stress and behavior under the earthquake loads when the system is placed on the lean concrete or base slab were not taken into consideration; yet, basically a guideline was created showing the design and safety level for a specific height, slab thickness, amount of live load and certain configurations of rebar layouts. Configurations...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department 3-a. Structural Modelling In order to analyze the behavior of the systems with different ABS Plus Disposable Formwork System configurations under vertical loads, a 7.1mx7.1m slab system composed of 10 units in both axis directions was created using SAP2000 computer program. Two models were created separately for C25 and C30 concrete classes, 375 different models were set considering the various structural parameters in Figure 2. For example, Figure 4 shows the 3D analytic model prepared with C25 concrete class,...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Similarly, taking the different live loads (q) given in Figure 2 into account, total design load (p) was calculated in accordance with TS-500 regulations by the help of the load consolidation formula given below: p = 1.4xg + 1.6xq Among the live loads, to specifically determine the truck load effect, a longer system that can contain a truck was modelled as seen in Figure 5. In the first stage, only first three vibration modes were examined for each configuration to make a modal analysis using the self-weight...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Figure 6: First three modes of the sample system In the second phase of the analysis, internal forces occurring in the slabs and columns arising from uniformly distributed live loads acting on the raised floors were calculated separately for each configuration considering the design loads. Column internal forces in the case that a live load of q=20 kN/m2 is acting on the sample system are given in Figure 7. Figure 7: Internal forces in the columns of the sample system under p=37.88 kN/m2 design load: axial force...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Alterations in the bending moments occurring in the slabs of the same sample system under the effect of q=5 kN/m2 (a); q=10 kN/m2 (b); q=20 kN/m2 (c) ve q=50 kN/m2 (d) live loads are given in Figure 8. Figure 8: Bending moments in the slabs of the sample system under various live loads After similar analyses have been completed for all of the alternative systems, reinforced concrete sections were designed. Alternative reinforcing steel bars to be used in the application and their layouts are summarized in Table...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department Structural analyses and capacities of the components are studied comprehensively for the system configurations given in Table 1 and various rebar layouts summarized in Table 2. Required reinforcement areas in slabs for the sample system presented above are given in Figure 9 for q=5~50 kN/m2 live loads; bearing capacities are shown in Figure 10 assuming the amount of rebar Figure 10: Column capacity values for the sample system under various live loads 9 ITU Civil Engineering Faculty, Civil Engineering Department...

ISTANBUL TECHNICAL UNIVERSITY CIVIL ENGINEERING FACULTY Civil Engineering Department After repeating similar analyses for all the system configurations and alternative rebar layouts, analyses were carried out using the model created for truck load. Maximum slab bending moments (a), column axial forces (b), shear forces (c) and bending moments (d) arising from the p design loads occurring on the system in the analytic model in Figure 5 are presented in Figure 11. Figure 11: Internal forces in the sample system calculated under the truck load effect Taking the live truck load for each system configuration...