بررسي شكل پذيري اتصالات L و T شكل ديوارهاي 3Dپانل تحت بارگذاري جانبي و ثقلي

Ductility analysis of L & T shaped wall to wall connections of 3D panels subjected to lateral & gravity loading

كشور ايران به دليل دارابودن شرايط اقليمي خاص نظير قرارداشتن در كمربند زلزله خيز جهان و وجود شرايط اجتماعي نظير كمبود مسكن نيازمند تغييرات اساسي در مصرف مصالح ساختماني و استفاده از سيستم صنعتي توليد مسكن است. پانل‌هاي سه بعدي (3D Panel) يكي از بهترين گزينه‌ها براي ساخت و ساز صنعتي و علي‌الخصوص انبوه‌سازي است. در اين پژوهش طرح هاي پيشنهادي مختلف براي اتصالات L و Tشكل ديوار به ديوار 3D پانل تحت بارگذاري جانبي- سيكلي و ثقلي با نرم-افزار ANSYS مدل‌سازي شده و مورد تحليل قرار گرفته اند. نتايج تحليل عددي نشان مي دهند كه كلاف قايم بتني و شبكه‌ي فولادي WWF3/3/50/50 تاثير مثبتي در شكل پذيري و مقاومت نهايي اتصال دارند. بنابراين بين طرح‌هاي مختلف مناسب‌ترين طرح براي اين اتصالات، طرحي است كه شبكه‌ي فولادي WWF3/3/50/50 و كلاف قايم بتني دارد.

Construction industry in the developed countries has passed the traditional state and has become industrial decades ago. During this process, it was tried to use stylistic qualities, resistance, incorporation, insulation, speed in installation, performance facility, etc. in the consumed materials. Iran requires basic changes in using construction materials and industrial system of house production due to its particular climatic conditions such as being located on the earthquake belt and social conditions such as lack of house. 3D panel is one of the best options for industrial construction and especially mass building. The 3D panels consist of a polystyrene core (EPS) with a thickness ranging from 40 to 100 mm sandwiched between two plane-parallel welded wire mesh sheets (cover meshes) and inclined diagonal wires in between that go through the EPS core and that are welded to the cover mesh’s line wires. Despite the plethora of researches on 3D shotcrete prefabricated panels, not many researched have been conducted on the connections of these structures. Consequently, the researches on the structures constructed with this system still continue, because the components behavior individually differs with their behavior in a single system. This new construction system came to Iran from Europe and earthquake forces in Europe is very negligible. Hence, the seismic behavior of the connections in these structures has not been studied sufficiently and the conducted works on the issue have been in Iran. In this research, different suggested designs for L & T shaped wall to wall connections of 3D panel under lateral-cyclic and gravity loading were modeled and analyzed by ANSYS software. Numerical analysis indicates that concrete vertical tie beam and welded wire mesh WWF-3/3/50/50 have positive effect on the ultimate strength and ductility of the connection. Hence, the most appropriate design for the connections is the one with welded wire mesh WWF3/3/50/50 and concrete vertical tie beam.